Electric switch gear



N v-13.1934- F. ANDQRFF ET AL 1,980,139

ELECTRIC SWITCK em Filed Oct. 15'. 1951 UNITED STATES PATENT OFFICE ELECTRIC SWITCH GEAR Fritz Andorff, Viernheim, and Willy Speidel,

Ludwigshafen-on-the signors to Aktiengese -Rhine, Germany, llschaft Brown Boveri et Cie, Baden, Switzerland, a. joint-stock company of Switzerland Application October 15, 1931,

In Germany October 6 Claims.

Our invention relates to improvements in electric switchgear.

One of the objects of our invention is to provide improved electric switchgear which may be 5 constructed as a completely enclosed unit for high tension, and whic h can be associated with other similar units to constitute a ring-connection power supply system.

Other objects and advantages will hereinafter appear.

In accordance with our invention, a power oil switch and bus-bar-disconnecting switches are housed in separate oil chambers or casings disposed one above the other and in spaced relation,

the adjacent bottom an d cover of the two oil casings forming part of an air chamber for housing the current and voltage sociated connections.

Our invention resides in transformers and the asthe improved construction of the character hereinafter described and claimed.

For the purpose of illustrating our invention,

an embodiment thereof is shown in the drawing,

wherein Figures 1 and 2 are partly diagrammatic, simplified, vertical sectional views, of electric switchgear constructed invention, the sections in planes at right angles to In the drawing, the r nates an oil chamber shown, with bus-bar alignment, and in the s in accordance with our being taken respectively each other.

eference numeral 3 desigor casing provided, as

terminals 2 disposed in ame plane. Fixed switch parts 4 are supported in the plane of the bus-bar terminals and betwe thereof.

en the adjacent ends tending ends of the switch contacts 1, as indicated in sociated with suitable means for moving them quickly ing position. As shown then in alignment with bus-bar terminals. The

Fig. 1, are asconventional actuating out of connectin Fig. 1, when the switch contacts 1 are in connecting position they are,

in effect, part of the bus bars.

That is, they are and in the same plane as the bus-bar terminals. By reason of this construction and arrangement,

electrodynamic stresses 7 are avoided, since the current flows in a straight path through the bus-b ar terminals 2, the switch part 4 and the bridging switch contacts 1.

The cover of the casing 3 is provided with openings from which funne 15 extend downwardly,

l-shaped insulating tubes with their inner ends in Serial No. 568,934

close proximity to the respective bus-bar terminals. The openings in the casing cover are closed by suitable caps 16. When it is desired to test the voltage on the oil-emerged bus-bar terminals 2, the caps 16 are removed, and the contact pieces of the testing apparatus are inserted through the tubes 15, which act as guides and insure proper contact with the terminals 2.

A main oil switch, designated generally by the reference numeral 5, includes an oil casing 11.

The oil casings are disposed one above the other and in spaced relation, as shown, the bottom 7 of the casing 3 and the top or cover 6 of the cas ing 11 forming part of an air chamber 8 for housing a current transformer 9 and the various other electrical apparatus and connections associated with the switchgear. Access to the chamber 8 may be had through the opening shown, which is normally closed by a plate 10.

The usual measuring instruments and relays associated with the switchgear, and which are designated respectively by the references 12 and 13, are housed in a low-tension chamber 14 formed by the wall structure of the casing 3, and which is disposed at substantially the level of the busbar terminals 2.

The advantages of the ring-connection system for the distribution of electrical energy are well known. The application of the system in enclosed switching arrangements, such as that described above, is new and provides important advantages. The disposal of the bus-bar switches above the main oil switch allows for the best utilization of the space over a small superficial area. If a breakdown occurs in a field, the traversing bus bar can be divided by opening the disconnecting switches lying in the adjacent fields. The disturbed field is thus completely out off, so as to carry no current, and can even be exchanged. This causes no disturbance whatever in the operation, as the feeding cables will then separately supply the fields which are still connected up. Upon the whole, or a portion of the connected power being switched over to one single supply cable, it is only necessary to open one single bus-bar oil switch, while in the case of known switching arrangements with double bus bars, several or all of the switch units have to be switched over.

While but one embodiment of our invention has been described, it will be seen that various modifications, such as in the size, shape and arrangement of the parts, can be made without departing from the spirit of the invention, or the scope of the claims.

We claim as our invention:-

1. In electric switchgear, a switch device, a casing for said device, a second switch device, a casing for said second switch device, electrical apparatus disposed between said switch devices, a housing enclosing said electrical apparatus, the respective adjacent wall structures of said casings being common to and forming part of said housing, and means connecting said switch devices and said electrical apparatus and [extending through the wall structure of said casings and housing.

2. In electric switchgear, an oil chamber provided with bus-bar terminals, bus-bar-disconnecting switches disposed in said chamber and movable into and out of connecting relation with said terminals, a second oil chamber, an oil switch disposed in said second chamber, electrical apparatus disposed between said chambers, said chambers being disposed one above the other and in spaced relation'whereby the adjacent bottom and top wall structures thereof form part of a housing for said electrical apparatus, and means for connecting said switches and said electrical I apparatus.

3. In electric switchgear, a casing provided with fixed bus-bar terminals disposed in a substantially straight line, and means for connecting the adjacent ends of said terminals comprising switch contact means supported for movement into and out of a position between and in fixed bus-bar terminals disposed in alignment in a given plane, and means for connecting the adjacent ends of said terminals comprising switch contact means supported for movement into and out of a position in said plane and between and in alignment with said terminals to make contacting engagement with the respective adjacent ends thereof whereby the current flows in a straight path through said terminals and said switch contact means bridging the same.

5. In electric switchgear, a casing provided with fixed bus-bar terminals disposed in alignment in a given plane, a switch part supported in said plane between the adjacent ends of said terminals, and switch contacts supported for movement into and out of position in said plane and in alignment with and in contacting engagement with said switch part and the adjacent ends of said terminals whereby the current flows in a straight path through said terminals and said switch part and the bridging switch contacts.

6. In electric switchgear, a casing provided with fixed bus-bar terminals disposed in alignment in a given plane, a switch part supported in said plane between the adjacent ends of said terminals, switch contacts supported for movement into and out of position in said plane and in alignment with and in contacting engagement with said switch part and the adjacent ends of said terminals whereby the current flows in a straight path through said terminals and said switch part and the bridging switch contacts, a switch, and a connection between said switch and said switch part.

FRITZ ANDORFF'.

WILLY SPEIDEL. 

